Stove-pipe thimble



` (No Model.)

- A. J. MARTIN.

srovf: HPB THIMBLB.l No. 308,272. Y Patented Nov. 18,1884.

N. Piraa Pnumuuwgnvher. wmingwn. nc

UNrrn Sterns Artnr Fries,

ANDREW J. MARTIN, OF CARLISLE, OHIO.

STOVEHPIPE THIMBLE.

SPECIFICATION forming part of Letters Patent o. 308,272, dated November18, 1884.

(No model.)

To all whom t may concern.-

Be it known that I, A. J. MARTIN, a citizen of the United States,residing at Carlisle, in the county of Varren andState of Ohio, haveinvented a new and useful StovePipe Thimble, of which the following is aspecification, reference being had to the accompanying drawings.

lIhis invention has relation to stove-pipe thiinbles to be used inceilings and partitions for registers and stove-pipes to prevent fire`from being communicated from the register or stove-pipe to thebuilding; and it consists in the construction and novel arrangement ot'parts, as will he hereinafter fully described, and particularly pointedout in t-he claim appended.

Figure l is avertieal longitudinal sectional view of a stove-pipethimble embodying the improvements of my invention. Fig. 2 is a verticalcrosssection on the line x x in Fig. 1. Fig. 3 is a perspective det-ailView of a portion of the outer cylinder, showing the sawtooth rack; andFig. I is a perspective detail view of the inner cylinder, showing theintegral notched guide-groove and the spring provided with the stud forengagingthe saw-tooth rack.

Referring by letter to the accompanying drawings, a designates the outercylinder of the thimble, and b the inner cylinder of the same, each ofwhich is provided with the cast-iron flange-plates e c, provided withthe central orifice in which the stove-pipe rests when in place, andexternal to these orilices a series o'f`ventilating-holes usuallyprovided in such plates. rIhe external cylinder, a, is provided upon itsinner face, preferably directly opposite the seam therein, with asaw-tooth rack, d, the teeth df of which lean or point toward thetlanged end oi' said cylinder. This rack dextends from quite near theinner plain end of the cylinder a throughout one-halt1 or more of itslength, as shown. The Vinner cylinder, b, is provided, preferably in itsside op- 1 5 posite the seam, with an inwardly-indented integralguide-groove, c, extending the entire length ot' the cylinder, which isprovided a short distance from its outer end with a notch, j', toreceive the lateral stud g, fixed to the iiat spring h, pivoted on theinner face of said cylinder I) near its flange end, extending alongsideot' the grooved guide e, and provided `at its inner end with a suitablenger-piece, 7c, by which to lift the stud from the notch to disengage itfrom the teeth of the rack when the cylinders are to be adjustedlongitudinally.

By this construction the thimble can be adjusted to varying thicknessesbetween tloor and ceiling, between partition-walls, and other placeswhere stove-pipe thinibles are to be used. As there are no holes in thecylinders, sparks cannot escape, and as there is ample ventilation,there can be no danger from ignition at the points where these thimblesare used; This device possesses simplicity, security, durability,cheapness, and general efflcicncy.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is

In a stove-pipe thimble, the combination, with the outer cylinderprovided on the interior with the saw-tooth rack, of the inner cylinderprovided with the inwardly-extending guide-groove having a notchtherein, and the pivoted 4spring provided with the.lateral stud forentering the notch and engaging the teeth of the rack in the groove tohold the cylinders to their adjustments, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

ANDREV J. MARTIN.

Witnesses:

J. M. DAOHTLER, HARRY DAGHTLER.

